330 Notes on New Species 



forms here found are peculiar to these localities, and are 

 still for the most part unknown to microscopists, I have 

 endeavored to complete the publication of these plates, by 

 the study of the original forms in the possession of the 

 Society, and by means of pencil notes, accompanying cam- 

 era sketches, among the Memoranda of the Microscopic 

 Collection. Most of the forms contained in the plates I 

 have satisfactorily identified upon the slides, and have 

 carefully verified all the descriptive notes, v/hich accom- 

 pany the sketches. It has of course been impossible for 

 me to supply from such scanty material, and from speci- 

 mens mounted nearly six years ago, all the minute details 

 desirable in the delineation of such objects, but yet I trust 

 sufficient is given to render the species distinct and of 

 easy recognition. Where a doubt was entertained as to 

 the character of surface-markings, I have considered it of 

 more advantage to leave such details unsupplied, than to 

 add what future and better specimens might prove erro- 

 neous. 



Fig. 1. Amphora delphina, L. W. B., nov. sp. Frus- 

 tules elliptic-oblong, with broad, slightly rounded ends ; 

 valves very minutely and transversely striated ; nodules 

 very large, extending in a bar across the centre of the 

 valve ; valves in front view gibbous at the centre ; outer 

 portions canoe-shaped; aspect hyaline; terminal nodules 

 distinct. 



Hab. Para River. 



This species, which is very rare even in this locality, in 

 general characters resembles Amphora Icevis of Gregory. 

 It differs from that species in the sides in F. V. being 

 curved outward so as to be quite gibbous, instead of being 

 incurved as in A. Icei'is, while the nodule is much larger, 

 and contracts towards the connecting membrane. The 

 striations could just be seen with Spencer's /^ in- objective, 

 and oblique light. With moderate powers the aspect is 



